Question about installing a 5 point harness system

[Jdmpanda]

I am currently ordering an Autopower 4 point roll bar and my car currently has a Sparco Evo II seat. Can anyone tell me how do I install a 5 point harness into a 2005 Subaru STI? I understand how to do the shoulder and lap harness but the one that prevents you from submarining I'm a little confused about. Is it legal to mount it to the sparco seat base? This will also be my first time running in an HPDE event and I just want to make sure to have my car up to par for tech inspection.

[Ev]

While it may pass, I recommend you go through the floor under the seat. This way you are being held in by something other than the seat. You can get one of these, and a clip so install and removal is easy

[whoahstu]

I would go with a 6 instead of a 5. There's no reason not to.

 

From Schroth: https://www.schroth.com/en/segments/racing/service/installation-instructions.html?file=files/schroth/pdf/installation-instructions/racing/EA_8-2__2014-11.pdf

 

From SFI: http://www.sfifoundation.com/wp-content/pdfs/guidelines-bulletins/Seatbelt%20Installation%20Guide%2006-05-12.pdf

[timtt]

Definitely don't mount the anti sub strap to the seat. It has to be mounted to the floor or at a minimum to the bolted-in base that the seat is mounted to. There was a https://rennlist.com/forums/993-forum/1027960-tillet-racing-seats-installed.html%20good%20Rennlist%20discussion about this recently including some brainy calculations on https://rennlist.com/forums/showpost.php?p=14905928&postcount=36%20how%20strong%20the%20material%20needs%20to%20be to mount that strap.

 

I would also go for a stronger backing plate on the chassis like https://www.torqued.io/planted-reinforcement-plate%20this%20one which I would screw with a grade 8 bolt as bolt -> spring washer -> washer -> Schroth triangular tab -> a couple washers to raise tab off floor and not put pressure on the sub strap -> chassis hole -> backing plate.

 

Hopefully that helps!